visad
Class QuantityDimension

java.lang.Object
  visad.QuantityDimension

All Implemented Interfaces:

Serializable, Comparable

public final class QuantityDimension
extends Object
implements Serializable, Comparable

This class represents the dimension of a quantity. For example, consider a nonrelativistic particle of mass m in uniform motion which travels a distance l in a time t. Its velocity is v=l/t and its kinetic energy is E=mv²/2=ml²t^-2/2. The dimension of E is dim E=ML²T^-2 and the dimensional exponents are 1, 2, and -2. A QuantityDimension is immutable.

See Also:

Serialized Form

Constructor Summary

QuantityDimension()
Constructs from nothing (i.e. constructs a dimensionless quantity).

QuantityDimension(QuantityDimension that)
Constructs from another dimension of a quantity.

QuantityDimension(Unit unit)
Constructs from an existing Unit.

Method Summary

int	compareTo(Object obj) Compare this dimension of a quantity to another.
QuantityDimension	divide(QuantityDimension that) Divide this dimension of a quantity by another.
boolean	equals(Object obj) Indicate whether or not this dimension of a quantity is the same as another.
boolean	isDimensionless() Indicate whether or not this dimension of a quantity is dimensionless.
static void	main(String[] args) Test this class.
QuantityDimension	multiply(QuantityDimension that) Multiply this dimension of a quantity by another.
QuantityDimension	raise(int power) Raise this dimension of a quantity by a power.
String	toString() Return a string representation of this dimension of a quantity.

Methods inherited from class java.lang.Object

clone, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

QuantityDimension

public QuantityDimension()

Constructs from nothing (i.e. constructs a dimensionless quantity).

QuantityDimension

public QuantityDimension(QuantityDimension that)

Constructs from another dimension of a quantity.

QuantityDimension

public QuantityDimension(Unit unit)
                  throws UnitException

Constructs from an existing Unit.

Throws:

UnitException

Method Detail

compareTo

public int compareTo(Object obj)

Compare this dimension of a quantity to another.

Specified by:

compareTo in interface Comparable

equals

public boolean equals(Object obj)

Indicate whether or not this dimension of a quantity is the same as another.

Overrides:

equals in class Object

raise

public QuantityDimension raise(int power)

Raise this dimension of a quantity by a power.

multiply

public QuantityDimension multiply(QuantityDimension that)

Multiply this dimension of a quantity by another.

divide

public QuantityDimension divide(QuantityDimension that)

Divide this dimension of a quantity by another.

isDimensionless

public boolean isDimensionless()

Indicate whether or not this dimension of a quantity is dimensionless.

toString

public String toString()

Return a string representation of this dimension of a quantity.

Overrides:

toString in class Object

main

public static void main(String[] args)

Test this class.